Weight, Gravitational Force

  • #1

Homework Statement



A mass weighs 20 N at the surface of a planet of 3000 km radius. What is the mass's weight when it is in orbit 3000 km above the surface of the planet?

Homework Equations


F = (Gm1m2)/r2 (well... not really)
Ug = mgy


The Attempt at a Solution


I don't even know. I'm trying to find the g on this planet but I'm not sure where that would lead me... Help please >_<
 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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what is the new 'r' you want to find? How does that relate to the original 'r'?

r= r at surface then

GMm/r2= ?
 
  • #3
yeah, i just needed to write the equations out instead of just thinking in my head

thanks!
 

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